April in Frankfurt am Main is the sunniest month of the year. In April, the weather in Frankfurt am Main is typically warm. Average daily high temperature in April is about 14 degrees above zero. On average, Frankfurt am Main has 12 rainy, 9 sunny, 8 partly cloudy, and 1 cloudy day in April. The rains are usually moderate. April as well as January, February, March, and October is considered the most uncomfortable time to visit Frankfurt am Main.